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Intermittent weird engine noise

Old 09-01-2015
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Intermittent weird engine noise

Hello to all users
I am new at this forum. I own Honda Civic 2002, vtec. I am worried about the weird engine noise coming from valve cover or timing belt area, can't differentiate. This noise is intermittent that I appears on acceleration then suddenly disappears. During idle it appears sometimes. So there is no hard and fast rule, its appears and suddenly gone.

I made an audio clip please check it.

Please pay attention to metallic sound which comes like two something hitting on cog wheel.

Thanks in advance.

Regards
Attached Files
File Type: mp3
Engine_sound.mp3 (441.6 KB, 158 views)
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Old 09-01-2015
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Re: Intermittent weird engine noise

Sounds like something might be rubbing the timing cover?
Can you 'feel' the noise in the plastic timing cover?

Use a stethoscope to locate the source of the noise, wherever it may come from.
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Re: Intermittent weird engine noise

@ezone thanks

Yes I have checked with the stethoscope and it is loudest at valve cover. But worrisome thing it appears and disappears for some times.
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Re: Intermittent weird engine noise

Louder near the oil fill cap area?
Look inside and see anything? Anything dropped into the oil fill hole?
What do the visible rocker arms look like? Golden with oil, or caked in sludge?
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Old 09-02-2015
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Re: Intermittent weird engine noise

@ezone
Yeh its louder at valve cover, the oil is shiny golden, nothing is dropped in that area. I also checked this by removing valve cover. Is this from timing belt pully? or from any bearing (?may be) which holding the rocker arm assembly?
But it is intermittent.
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Old 09-02-2015
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Re: Intermittent weird engine noise

Originally Posted by junkyardguy View Post
the oil is shiny golden,
I did not mean checking the oil condition, I asked about checking whether or not the rocker arms are covered in a layer of sludge. If they are, it might have VTEC lock pins sticking in the arms.


nothing is dropped in that area. I also checked this by removing valve cover.
That would have made it too easy LOL

Is this from timing belt pully? or from any bearing (?may be) which holding the rocker arm assembly?
But it is intermittent.
I dunno man, you have the car in front of you, not me. Where is the noise coming from? Remove the timing cover and stethoscope the area if you think it may be there.
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Old 09-02-2015
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Re: Intermittent weird engine noise

No sludge on rocker arms. Any possibility of noise. Please any expert help in this matter.
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Old 09-02-2015
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Re: Intermittent weird engine noise

Originally Posted by junkyardguy View Post
. Please any expert help in this matter.




/some people knew this was coming
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Old 09-02-2015
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Re: Intermittent weird engine noise

@ezone
Thanks buddy
Thanks brother. Please tell me can I start the engine with open valve cover? I want to locate this metal beating sound.
Please tell me can I start engine with open valve cover? because I have to locate this metal beating sound.
Thanks brother. Please tell me can I start the engine with open valve cover? I want to locate this metal beating sound.
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Old 09-02-2015
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Re: Intermittent weird engine noise

I suppose you could start the engine with the valve cover off but it's gonna sling oil everywhere and probably make a huge honkin mess if you manage to make it happen.

I've never attempted to start one with the valve cover off.

I know I would try my hardest to protect the timing belt from getting contaminated with oil.
Keeping the timing belt clean is everything.

These engines will bend valves if the timing belt lets go.



I'd say to check into the timing cover areas for a problem though, since you'll have the valve cover out of the way. It's easy to run the engine without the timing cover, just don't drop anything into the area of the belt with it running.

These engines will bend valves if the timing belt lets go.

HTH
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Old 09-02-2015
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Re: Intermittent weird engine noise

@ezone
Thx alot dear.
Really appreciate your guidance.
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Old 09-02-2015
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Re: Intermittent weird engine noise

What engine size does your car have?
1.3L?
1.4L?
1.5L?
1.7L?
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Old 09-03-2015
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Re: Intermittent weird engine noise

Its 1.6 (D16W9) 1590 cc, 130 HP with manual transmission
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Re: Intermittent weird engine noise

@ezone
Its 1.6 (D16W9) 1590 cc, 130 HP with manual transmission.
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Old 09-03-2015
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Re: Intermittent weird engine noise

I asked because I realized you weren't in North America.
I'm not familiar with that particular engine version...


Have you removed accessory drive belts and tried it?
Is the noise still present without accessory belts installed?

Have you inspected in the timing belt area yet?
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Old 09-04-2015
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Re: Intermittent weird engine noise

@ezone
Yeh its an Asia model.
Yes I have removed the accessory belts the noise is gone. Someone said its Aircon compressor bearing sound. I replaced the bearing but sound is still there. Generator bearing is also in good condition.
Recently (5k Kms back) timing beat, bearing and water pump have been changed. Threads of bolt of tensioner bearing were damaged, the mechanic made the new threads and insert a little larger bolt (which had threads on both ends) on which tensioner bearing fits securely and then a nut is tighten on the other end of bolt to hold the tensioner bearing in its place.
He also changed the seals there in timing belt area and every thing was seems to be alright.
But I am in doubt that this noise may be of this alteration?
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Old 09-04-2015
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Re: Intermittent weird engine noise

Yes I have removed the accessory belts the noise is gone.
At the point you found this, one normally would reinstall the belts one at a time rechecking if the noise returns after installing each belt so you know which accessory or system is causing the noise.


One usually can spin each accessory pulley by hand and listen closely, the noise of a bad bearing should be readily apparent.

If there is a separate adjustment pulley for the air conditioner belt, it needs checked too.

Someone said its Aircon compressor bearing sound. I replaced the bearing but sound is still there.
What exactly was replaced here?
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Old 09-04-2015
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Re: Intermittent weird engine noise

@ezone
the bearing just below the air-conditioner pulley and magnetic clutch.

Please tell me about the threads problem which was solved by making threads and using a little bolt for tensioner bearing. Is it Ok?
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Old 09-05-2015
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Re: Intermittent weird engine noise

Please tell me about the threads problem which was solved by making threads and using a little bolt for tensioner bearing. Is it Ok?
I can not see what was done to your engine, but thread inserts are an accepted repair and can be quite strong if done correctly. If it is holding together thus far, it's probably OK.
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Old 09-06-2015
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Re: Intermittent weird engine noise

Originally Posted by junkyardguy View Post
@ezone
the bearing just below the air-conditioner pulley and magnetic clutch.

Please tell me about the threads problem which was solved by making threads and using a little bolt for tensioner bearing. Is it Ok?
Dude Get a shorter belt bypassing the AC compressor install everything else. Probably your compressor shaft was bend to begin with. Removing the cluch to replace the bearing made things worse bending the shaft further. How I know this? It happen to me a month ago.
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Old 09-06-2015
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Re: Intermittent weird engine noise

@ ezone,
@ emich

Thanks guys, I will try to use shorter belt and then let you know.
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